The linearly polarized Double-Ridged Waveguide Horn Antenna R&S®HF906 is a broadband, compact transmitting and receiving antenna for the frequency range 1 GHz to 18 GHz. High gain and low VSWR allow the measurement of low field strengths as well as the emission of high powers without any significant return loss. The use of an N connector allows easy adaptation to existing equipment as well as high input power. The antenna is made of aluminum and tinned GRP boards to keep its weight low.